AGILE detection of the gamma-ray blazar PKS 1830-211

ATel #2242; E. Striani (Univ. Roma Tor Vergata), F. Verrecchia, C. Pittori (ASDC), M. Tavani (INAF/IASF-Rm), F. D'Ammando (Univ. Roma Tor Vergata and INAF/IASF-Rm), I. Donnarumma (INAF/IASF-Rm), S. Vercellone (INAF/IASF-Pa), V. Vittorini, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, G. Piano, G. Pucella, S. Sabatini, A. Trois (INAF/IASF-Rm), A. Bulgarelli, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, M. Marisaldi, M. Trifoglio, G. Di Cocco (INAF/IASF-Bo), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Santolamazza, S. Colafrancesco, P. Giommi,(ASDC), L. Salotti (ASI)
on 14 Oct 2009; 18:33 UT
Credential Certification: Carlotta Pittori (carlotta.pittori@asdc.asi.it)

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During the current AGILE pointing centered near the Galactic Center, the AGILE Gamma-Ray Imaging Detector (GRID) has detected significant gamma-ray emission above 100 MeV from a gamma-ray source positionally consistent with the blazar PKS 1830-211.

Integrating from 2009-10-12 00:03 UT to to 2009-10-13 04:57 UT, a maximum likelihood analysis shows a detection at a significance level above 5 sigma, with a source flux reaching a gamma-ray flux of (160+/-50) e-8 ph/cm2/sec above 100 MeV.

By integrating on a longer time-span, between 2009-10-05 04:50 UT and 2009-10-11 03:39 UT, AGILE/GRID detects PKS 1830-211 at a significance level above 3 sigma with an average flux of about 40 e-8 ph/cm2/sec.

There is evidence of significant spectral variability above 100 MeV during the last 7 days. We strongly encourage multi-frequency observations of PKS 1830-211, while AGILE will keep pointing the Galactic center until 2009-10-15 12:00 UT.